This is something I can look into! I will investigate the feasibility of this and let you know when I find an answer. I also have a few features I want to add to the next version, just a matter of finding the time to implement them...

I have done some looking into this, and as I suspected, there is no way of distinguishing an owner outright in WordPress multisite. There are other workarounds, such as custom roles, but there's not really a realistic way for me to build that into this plugin. Unfortunately the closest I can get you with this plugin for now is by emailing administrators only when you select roles.

I am working on adding a feature to export the user list that the plugin generates to a csv file that you can do what you want with, but on a busy grad student schedule, it's going to take me some time to implement that.